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In most nightclub environments, dark wool, cotton or synthetic slacks mate well with a button up shirt. Gentlemen in nightclubs should use caution to distinguish between button-up shirts appropriate for nightclub wear and the dressier, somewhat stodgier button-up shirts intended for professional office wear.
A black cocktail dress, known as the little black dress (LBD) - is versatile to wear for all occasions, from formal events to your aunt's birthday bash and for going out clubbing. In fact, it's hard for it to look inappropriate because it will fit in no matter what.